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Steve Loughran commented on HADOOP-17764: ----------------------------------------- HADOOP-17812 is related to this; when backporting copy both in > S3AInputStream read does not re-open the input stream on the second read > retry attempt > -------------------------------------------------------------------------------------- > > Key: HADOOP-17764 > URL: https://issues.apache.org/jira/browse/HADOOP-17764 > Project: Hadoop Common > Issue Type: Bug > Components: fs/s3 > Affects Versions: 3.3.1 > Reporter: Zamil Majdy > Assignee: Zamil Majdy > Priority: Major > Labels: pull-request-available > Fix For: 3.3.2 > > Time Spent: 9h 10m > Remaining Estimate: 0h > > *Bug description:* > The read method in S3AInputStream has this following behaviour when an > IOException happening during the read: > * {{reopen and read quickly}}: The client after failing in the first attempt > of {{read}}, will reopen the stream and try reading again without {{sleep}}. > * {{reopen and wait for fixed duration}}: The client after failing in the > attempt of {{read}}, will reopen the stream, sleep for > {{fs.s3a.retry.interval}} milliseconds (defaults to 500 ms), and then try > reading from the stream. > While doing the {{reopen and read quickly}} process, the subsequent read will > be retried without reopening the input stream in case of the second failure > happened. This leads to some of the bytes read being skipped which results to > corrupt/less data than required. > > *Scenario to reproduce:* > * Execute S3AInputStream `read()` or `read(b, off, len)`. > * The read failed and throws `Connection Reset` exception after reading some > data. > * The InputStream is re-opened and another `read()` or `read(b, off, len)` > is executed > * The read failed for the second time and throws `Connection Reset` > exception after reading some data. > * The InputStream is not re-opened and another `read()` or `read(b, off, > len)` is executed after sleep > * The read succeed, but it skips the first few bytes that has already been > read on the second failure. > > *Proposed fix:* > [https://github.com/apache/hadoop/pull/3109] > Added the test that reproduces the issue along with the fix -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org